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CLRC663 Datasheet(PDF) 21 Page - NXP Semiconductors |
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CLRC663 Datasheet(HTML) 21 Page - NXP Semiconductors |
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21 / 132 page  CLRC663 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet COMPANY PUBLIC Rev. 3.3 — 3 April 2012 171133 21 of 132 NXP Semiconductors CLRC663 Contactless reader IC Remark: To send more bytes in one data stream the NSS signal must be LOW during the send process. To send more than one data stream the NSS signal must be HIGH between each data stream. 8.4.3 RS232 interface 8.4.3.1 Selection of the transfer speeds The internal UART interface is compatible to a RS232 serial interface. Table 20 “Selectable transfer speeds” describes examples for different transfer speeds and relevant register settings. The resulting transfer speed error is less than 1.5 % for all described transfer speeds. The default transfer speed is 115.2 kbit/s. To change the transfer speed, the host controller has to write a value for the new transfer speed to the register SerialSpeedReg. The bits BR_T0 and BR_T1 define factors to set the transfer speed in the SerialSpeedReg. Table 19 “Settings of BR_T0 and BR_T1” describes the settings of BR_T0 and BR_T1. Fig 13. Connection to host with SPI 001aaj641 tSCKL tNSSH tSCKH tSCKL th(SCKL-Q) tsu(D-SCKH) th(SCKH-D) th(SCKL-Q) t(SCKL-NSSH) SCK MOSI MISO MSB MSB LSB LSB NSS Table 19. Settings of BR_T0 and BR_T1 BR_T0 01234567 factor BR_T0 1124816 32 64 range BR_T1 1 to 32 33 to 64 33 to 64 33 to 64 33 to 64 33 to 64 33 to 64 33 to 64 Table 20. Selectable transfer speeds Transfer speed (kbit/s) Serial SpeedReg Transfer speed accuracy (%) (Hex.) 7.2 FA 0.25 9.6 EB 0.32 14.4 DA 0.25 19.2 CB 0.32 |
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